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The Ruby 12AX7AC5 HG High Grade tube is the Shuguang 12AX7 9th gen tube, but distributed by Magic Parts. These are a very consistently made tube, sweet sounding, and very warm. High grade is a measuring system used by Magic Parts, which basically means the tube is better suited for amps that need more quiet tubes. This Ruby tube is a re-labeled Sino, Chinese and Shuguang - it's all the same.

Customer Reviews

Mesa Boogie Mini Rectifier Review by Lyle

The tubes sound killer! I put them in a couple days ago and have been playing on them non stop. Great website man, and good suggestions on tubes! This was my 1st time changing tubes in an amp and everything went smooth. I will recommend your site to others! (Posted on 6/23/18)

Custom Audio Amplifiers Classic+ Review by Curt

Just wanted to say thanks ! These tubes sound really good in my Custom Audio Amplifiers Classic+, reminds me why I bought this amp and that I need to change tubes sooner next time ;)

Thank again!

Curt (Posted on 3/20/17)

Ruby 12ax7A-C5 Review by LJ Bullion

This tube absolutely rocked my amp with a warm tone and a high gain it supplied a balance as well, I used in the V3 closest to the power tubes; sooner or later the technology would have to catch up to the old sought after tubes of the 50's and 60's , without further ado ; this is it , the tube Gods have blessed this tube or at least the one I got . To the company that makes these tubes , your welcome (Posted on 1/23/15)

Randall RH50 Review by Brian

Comment: Hey Doug, I just really want to thank you for following me back and forth on the whole Randall RH50 12AX7 "to high gain or not to high gain" deal. You were right, the Ruby AC5s sound really good! I'm even turning the gain down when recording through an SM57! You also kicked ass in getting them to me in record time, literally. Thanks for everything. Brian (Posted on 3/23/14)

Marshall JMD1 Review by Don

Doug, Got the tubes for JMD:1 Marshall. It was a pleasure doing business with you and for those who have been reluctant to change tube suppliers, you won't be disappointed. Tubes arrived in no time at all. They were very well matched and made biasing a cinch. Good quality tubes and the amp has never sounded better! Thank s Doug, Don. (Posted on 7/26/13)

Awesome Review by Bob V

I put three of these in my three main preamp tubes of a mesa express 5:25. I had a hard time liking the distortion in the amp before, but these really make it a much more pleasant sounding distortion. I couldn't believe the difference. The "blues" channel was kind of muddy and dark before, but seems to be a little brighter with a little more gain (Posted on 5/30/13)